Add NODENAME in rabbitmq env
Add NODENAME in rabbitmq env

NODENAME is needed in some deployment (Centos) for use rabbitmq cli

Change-Id: I983021d5913b3e88fb7b934003583d48ee35b8d9
Closes-bug: #1804283

openstack/openstack-ansible-rabbitmq_server,openstack/openstack-ansible-rabbitmq_server